In Jain Dharma, watching 18+ / obscene content is generally considered unwholesome because it strengthens kāma-rāga (sensual attachment), vishaya-lālasa (craving for sense pleasures), and weakens brahmacharya and self-restraint.

For a layperson (śrāvaka/śrāvikā), it is usually not treated the same as a monk’s grave fault, because the vows are different. But it is still a serious blemish on right conduct and should not be ignored.

Jain approach for a layperson

A proper response is:

• Ālochana: honestly admitting the fault
• Pratikramaṇ: repentance and inner turning away
• Niyam / Pratyākhyān: taking a firm resolve not to repeat it
• If needed, simple penance such as:

- fasting or partial fasting - reduced food or sensory restraint - extra sāmāyik, japa, swādhyāya, or charitable acts - avoiding triggers and company that encourage it

Is “very major and serious purification” required?

It depends on:

• how intentional it was
• how often it happened
• how much attachment was involved
• whether it led to further wrongdoing

So, for a layperson, it is usually a matter of sincere repentance and corrective penance, not necessarily extreme purification unless the habit is deep or repeatedly indulged.

Practical Jain view

The main goal is:

1. Stop the act
2. Repent sincerely
3. Strengthen restraint
4. Protect the mind from future impressions

If this behavior is frequent, Jain tradition would view it as something that needs serious self-discipline and purification, but always in a way suited to a layperson’s vows and capacity.